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Often I see alloys described like this,

Lockalloy is an alloy that consists of 62% beryllium and 38% aluminum

Are the percentages mentioned here a weight percent (wt.%) or atomic percent (at.%)?

Is there a standard somewhere that governs this notation? I don't see this mentioned anywhere in the literature. How does everyone know when people are talking about weight or atom percentages?

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    $\begingroup$ Sometimes they will be nice and indicate ’wt.%’ or ‘at.%”, otherwise you have to look deeper at the document to see, or another source to compare. Metallurgy often uses weight percent, materials science atomic percent. $\endgroup$
    – Jon Custer
    Nov 12, 2020 at 18:52
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    $\begingroup$ google.com/… would indicate it is by weight : "Aluminum-beryllium (AlBeMet® AM162) is a powder metallurgy composite of Beryllium 62% by weight and 1100 series pure aluminum, 38% by weight." $\endgroup$
    – Jon Custer
    Nov 12, 2020 at 19:07
  • $\begingroup$ Engineers think weight per-cent . I can hardly remember seeing atomic % , no doubt in some research paper. $\endgroup$ Nov 12, 2020 at 21:51

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Whenever it is left unspecified, it is weight percent. I don't know of an official standard, but it is a very common tradition.

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